Nicotin salicylate and process of making same.



I arren STATES PATENT Fries,

GEORGE HENRY RICHARDS, OF LONDON, ENGLAND.

SPECIFICATION forming part of Letters Iatent No. 685,061, dated October22, 1901.

briginal application filed April 8, 1901, Serial No. 54,793.

Divided and this application filed July 31, 1901. Serial No. 70,421. (Nospecimens.)

T wit/612i, it ma concern: a U Be it known that I, Gno'nen HENRY Bron-ARDS, merchant, a subject of the King of Great Britain, residing at 128Southwark street, in the county of London, England,

have invented a compound for use in horticulture or agriculture foreradicating insect life or mildew and the process of manufacture of thesaid compound, (for which I have made application for patent in GreatBritain, dated November 9., 1900, No. 20,194,) of which the following isa specification.

It has long been common, in order to eradicate insect lifeor mildew inhorticulture or agriculture, to employ compositions or compoundscontaining nicotin as a principal or active factor, and the compoundshave been brought into use by being subjected to heat, so as to becomevaporized, the vapor being the medium by which the objects in View areattained. In the specification of a patent application made by myselfand filed the 8th of April, 1901, Serial No. 54,793, I have pointed outthat such compounds possess certain disadvantages in use. Thus themajority of such compounds are produced in fluid form and arenoncrystallizable, and this fluid form renders them extremelyinconvenient and wasteful in use, while it enlarges the difficulties ofpacking and transport. In other forms the nicotin has been mechanicallymixed with some absorbent material, such as clay, lime, sandstone, orthe like, and so made into a paste; but hitherto these so-called solidcompounds have not proved satisfactory, in that they all leave a bakedand hard residue after vaporization, which corrodes the receptacles inwhich vaporization takes place, rendering constant cleaning necessary,while not all the nicotin is evaporated and waste ensues.

Now in the specification of my patent application aforementioned, SerialNo. 54,793, of 1901, I have described a new chemical compound composedof salicylic acid and nicotin, and I there give directions by which thesalicylate of nicotin can be produced in the form of a solid salt andcompressed into cakes for convenient packing, transport, and use,while50 upon this chemical compound being subjected to heat the whole becomescompletely vaporized, leaving no residue, nor does it corrode thereceptacles in which it isvaporized. I found that although the chemicalcompound I have described in the said specification, Se- 5 5 rial No.54,793, of 1901, is extremely effective and presents all the advantagesI have there stated, yet it can be made to carry farther and its usee'conomized bythe addition of camphor, (gum-camphorg) while thisaddition to the solid salt also enables a firmer and stronger cake ortablet to be produced by pressure, which cake or tablet upon beingplaced into a dish or receiver and heat applied entirely melts andvolatilizes, leaving no residue in the dish.

I am quite aware that it has been proposed to include a proportion ofgum-camphor with sandstone and silicious earth in a mechanical mixturewith nicotin; but this mixture 7 does not possess the advantages of thespecific compound which forms the subject-matter of this specificationand claims.

In carrying out my invention I take about forty-two pounds of salicylicacid and fifty pounds of nicotin, preferably highly purified nicotin,and I dissolve the acid in the nicotin by means of heat. The mixture isthen set aside to crystallize, after which the motherliquor is drainedoff, and the solid salt (the salicylate of nicotin) is dried andpowdered, gum-camphor being added and mixed with the powdered salt inthe proportion of about one part, by weight, of the gum-camphor to abouttwo parts, by weight, of the solid powdered salt salicylate of nicotin.The compound is then compressed into cakes or tablets of convenient sizeand is ready for use.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. As a new article of manufacture, a solid compound for use inhorticulture or agriculture, for eradicating insect life and mildew, thesaid solid compound consisting of nicotin and salicylic acid forming asolid salt, with 5 powdered gum-camphor added to the said salt, themixture being compressed into the form of cakes or tablets which arecapable of being entirely volatilized by heat, substantially as setforth.

2. The process for preparing the whollyvolatilizable solid compound foruse in horticulture or agriculture for eradicating insect life ormildew, consisting of the combination with the nicotin and salicylicacid in the proportion of about forty-two pounds of salicylic acid tofifty pounds of nicotin, the acid being dissolved in the nicotin by theapplication of heat, allowed to crystallize, then drained and I finallydried and powdered producing a solid salt 1'. e. salicylate of nicotin;of gum-camphor 10 added to the aforesaid powdered solid salt in theproportion of about one part by Weight of the camphor to two parts byweight of the salicylate of nicotin, the compound being then compressedinto cakes or tablets,substautially as set forth.

GEORGE HENRY RICHARDS. Witnesses:

D. M. STARK, W. W. MARSHALL.

